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Last Deglaciation Climatic Fluctuation Record by the Palaeo‐Daocheng Ice Cap, Southeastern Qinghai‐Tibetan Plateau
Author(s) -
ZHANG Zhigang,
XU Xiaobin,
WANG Jian,
ZHAO Zhijun,
BAI Shibiao,
CHANG ZhiYang
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12352
Subject(s) - deglaciation , plateau (mathematics) , surface exposure dating , moraine , geology , physical geography , landform , cosmogenic nuclide , glacial period , glacial landform , climate change , debris , climatology , glacier , oceanography , geomorphology , geography , mathematical analysis , physics , mathematics , cosmic ray , astrophysics
The last deglaciation, a key period for understanding present and future climate changes, has long been the hot topic for palaeoclimatological study. The Qinghai‐Tibetan Plateau (QTP) is often a target study area for understanding hemispheric, or even global environment changes. The glacial landforms on the QTP provide a unique perspective for its climate change. In order to investigate the onset of the last deglaciation at the QTP and its regional correlation, the terrestrial cosmogenic nuclides (TCN) 10 Be and 26 Al surface exposure dating was chosen to date the roche moutonnée, the polished surface and the moraine debris located at the palaeo‐Daocheng Ice Cap (p‐DIC), southeastern QTP. Our results show that the onset of the last deglaciation is at about 19 ka, followed by another warming event occurring around 15 ka in the p‐DIC area. These timings agree well with other records, e.g. equivalent with a rapid sea level rise at 19 ka and the onset of Bølling warming event at about 15 ka. Thus, our new data can provide good reveal constraint on the climate evolution at the QTP.